I assume you would be looking, in this example, for 3 random products from the brand "Nike", in which case if you were happy to have the results in search results format then you could use the modified search shortcode as per your question in this thread using:

The IF condition will ensure that the direct links are only made if the result is not compared linking to the product page if they are so that the preferred link can be selected. If you'd prefer to make a re-query in this case to link to [one of] the lowest priced merchants just let me know...